In my EDC tin (LOST - need to buy a new tin, and make up a new kit - AARRRGH - Hope whoever found it appreciates the ARC AAA and the $20 in there) - in my desk, in my edc pack, in both cars...

And to respond to another person here - yep, a pair of wool socks, a change of skivies - and I wear patrol shoes. And I work in a Manhattan office. I also have a tendency to kick the shoes off at the office so they dry out during the day - they are laced loose enough that I can slip them on and off on most days

Take care of your feet, so they can take care of you